<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<script src="https://cdn.staticfile.org/jquery/1.10.2/jquery.min.js">
</script>
<script>
$(document).ready(function(){
  $("#btn1").click(function(){
    $("img").before("<b>之前</b>");
  });

  $("#btn2").click(function(){
    $("img").after("<i>之后</i>");
  });
});
</script>
</head>

<body>
<img src="/images/logo.png" >
<br><br>
<button id="btn1">之前插入</button>
<button id="btn2">之后插入</button>
</body>
</html>